%0 Journal Article %T 高纬度多年冻土区路基工后沉降变形<br>Roadbed settlement deformation after construction in permafrost regions of high altitude %A 王 %A 锐 %A 程培峰 %A 韩春鹏 %J 长安大学学报(自然科学版) %D 2017 %X 为研究东北大兴安岭多年冻土地区路基工后沉降变形特点，选取中俄(中国―俄罗斯)原油管道漠大（漠河―大庆）线林区伴行路典型断面，沉降监测设备采用分层沉降仪，通过沉降管上磁力环位置的变动来跟踪观测路基沉降变化，以DS18B20温度传感器为温度采集单元，布设温度监测系统监测多年冻土由于筑路引起的地温变化，并结合室内试验对多年冻土地温和冻土上限变化及路基沉降变形进行试验研究。研究结果表明：工程竣工通车后的2年里，由于路基填土覆盖致使地温升高、冻土产生退化、冻土上限下移；季节活动层压缩和冻土融化压缩是引起多年冻土区路基沉降的主要变形源，冻土融化压缩产生的变形所占比例最大，占总沉降量的50%；每年8～11月份时段融化层压缩导致路基沉降变形明显，进入12月份随着季节融化层冻结和冻土上限上移稳定，路基沉降开始趋缓；路基融沉发育具有一定的坡向性，在一个冻融循环期内，阴坡面路基下多年冻土融化时间比阳坡面的少30 d左右，阳坡面路基沉降量大于阴坡面路基沉降量；在相同条件下，高含冰量冻土融化压缩变形大于低含冰量冻土融化压缩变形，填高大于3 m的路堤随着填土高度的增加，冻土融化压缩变形增大。研究结果可为大兴安岭多年冻土地区修建公路和路基沉降变形病害分析提供理论参考。<br>To master characteristics of the roadbed settlement deformation after construction in the permafrost regions of Greater Khingan Mountains, this paper selected the typical roadbed section of China to Russia crude oil pipeline great line, used layered settlement instrument as settlement monitoring equipment to observe the change of roadbed settlement through the change of the position of magnetic ring on settlement tube. Taking DS18B20 temperature sensor as temperature acquisition unit, this paper set temperature monitoring system to monitor temperature changes of permafrost, and combined with laboratory test to study permafrost geothermal change and its change rule, and the subgrade settlement deformation. The results show that during the two years after the completion of the project, the ground temperature rising, permafrost degradation and the permafrost moving down that brought by the roadbed soil caused the natural seasonal melted layer compression and permafrost melted compression, which are the main causes of roadbed settlement deformation. Settlement caused by permafrost melted compression is the largest, about 50%. From August to November, melting permafrost layer compressed makes roadbed settlement deformation obvious. In December, as seasonal freezing and the permafrost move up stably, embankment settlement begins to slow. Roadbed thawing settlement development has a certain slope tropism. In a freezing and thawing cycle period, permafrost melting time under roadbed of shade slope is about 30 d less than permafrost melting time under roadbed of sunny slope, and embankment settlement of the sunny slope is greater than embankment settlement of the shade slope. In the same conditions, the high ice content permafrost is greater than that of lower. Permafrost melted compression deformation of embankments whose filling height is above 3 meters increases with the increase of the filling height. The research results can provide theoretical reference for road construction and analysis of roadbed settlement deformation in %K 道路工程 %K 高纬度 %K 多年冻土 %K 路基工后 %K 沉降变形< %K br> %K road engineering %K high altitude %K permafrost %K constructed roadbed %K settlement %U http://zzszrb.chd.edu.cn/oa/DArticle.aspx?type=view&id=201508038